Assessment of the tritium production in the HFTM specimen cells of IFMIF

The high-flux test module (HFTM) of the International Fusion Materials Irradiation Facility IFMIF will be exposed to an intense flux of neutrons with energies of up to approximately 55 MeV. The threshold of tritium-producing reactions in HFTM and the specimen materials is typically between 10 and 20 MeV, therefore the assessment of the tritium inventory becomes important for the handling of the specimen cells and specimens after the irradiation cycle. In this work, we calculate the tritium production in the specimen cells by neutrons with the McDeLicious code and activation nuclear data from the libraries EAF-2007 and IEAF-2007. The results differ by roughly a factor of two. We discuss ambiguities in the relevant activation data and conclude that better experimental verification of cross sections of isotopes most important for the tritium production in the test cells is desirable.